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The production of vegetables in Mexico under greenhouse conditions has been increased notably during the last years. Actually the area is about 1,250 ha. Tomatoes is the vegetables more important with 70%. The objective of this experiment was to evaluate ten beef tomatoes varieties growing on soil medium and to choice those with high yield, fruit quality and disease resistant. The experiment was carried out on the Experimental Station (INIFAP-CIRNO) inside Polyethylene greenhouse. The soil characteristics are clay loam texture, electrical conductivity (1.22 ds·m -1  and Ph 7.96). The date seedling establishment on 25 Oct. 2003 (28 days after sow seed). The plant density used was of 3.78 plants per square meter. The harvest period occurred from 20 feb. Feb. 20 to 27 May and they were carried out an average of sixteen cutting. There were nonsignificant differences in yield and weight fruit among varieties. Yield varied from 26.2 and 19.2 kg·m -2 . The varieties with more yield were Clarion, GC-29125, Attention, Thomas and Charleston with 26.2, 24.7, 24.4, 24.2 and 21.5 kg·m -2 , respectively. Fruit weight varied from 96.5 to 174.0 grams per fruit. The important insect pests in this year were Leaf Miner ( Lyriomyza  sp.); Army worm ( Heliothis op. ) and white fly ( Bemissia  sp.) however, we have not recorded any important disease during this trial.

Productivity and Fruit Quality in Tomatoes Varieties Under Greenhouse Conditions in the Northwest of Mexico